胺基改性花生壳粉吸附剂的制备及其对SO_2的吸附

Preparation of amine modified peanut shell powder and its adsorption to SO_2

以花生壳为原料,经溶胀、氯化和胺化改性制备SO_2吸附材料。利用傅里叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)、元素分析仪(EA)等分析手段对样品进行表征和测试,并探究了胺试剂种类、吸附剂含水率、烟气流速、吸附温度对SO_2吸附效果的影响。结果表明,胺基改性花生壳吸附剂脱硫效果明显;改性后花生壳纤维分子中引入了胺基,含氮量增加,吸附剂表面卷曲粗糙,孔洞明显;改性后吸附剂硫容与吸附剂中含氮量有关;链状结构的乙烯胺改性剂效果优于带有支链的尿素。实验中三乙烯四胺基花生壳(PS-TT)在含水率为100%、烟气流量为400 mL/min、吸附温度为35℃的优化条件下,硫容能达74. 6 mg/g。

A adsorption material for SO2 is prepared with peanut shell as raw material through swelling,chlorination and amination modification. The samples are characterized and tested by Fourier transform infrared spectroscopy(FT-IR),scanning electron microscopy(SEM) and elemental analyzer(EA).Influences of amine reagent types,water content in adsorbent,flue gas velocity and adsorption temperature on the adsorption efficiency to SO2 are investigated.The experimental results indicate that amine modified peanut shell adsorbent has good desulfurization efficiency. After modification,amine groups are grafted into peanut shell fiber molecular,which causes nitrogen content to increase. The surface of modified adsorbent is curling and rough,with obvious pores. The adsorption capacity of modified adsorbent to SO2 is corresponded with nitrogen content of adsorbent. Vinylamine modifier with a chain structure performs a better adsorption performance than urea modifier with branched chain.In the experiment,the adsorption capacity of triethylene tetramino-peanut shell(PS-TT) to SO2 can reach 74. 6 mg·g-1 under the optimal conditions as follows: water content is100%,flue gas flow is 400 mL·min-1 and adsorption temperature is at 35℃.